Refrigerator



FIG. 1 is a left, upper front perspective view of a refrigerator in accordance with an embodiment of our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof, the left side elevation view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a right, bottom front perspective view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a refrigerator, as shown and described. 